Question... My GM Tech2 scanner only shows calculated fuel rate, and this number is constantly changing fast enough that it's hard to decide what to call it. Is there something else I am supposed to be going by? I tried searching but couldn't find anything. I am definitely having an injector issue with occasional fuel knock and occasional smoke at idle. The problem is, it is intermittent and has been hard to track down. I haven't caught it smoking at idle when I was near my scanner, or I would have just shut off cylinders one at a time until it quit smoking.